"There are now five different lines of observational evidence pointing to the existence of Planet Nine," said Konstantin Batygin, a planetary astrophysicist at Caltech in Pasadena.

Some of these clues relate to the gravitational tug of Planet Nine, which appears to be disturbing the distant Kuiper Belt, which is made up of icy objects and stretches from Neptune out into deep space.

Its believed Planet Nine is a "super-Earth", the name for a type of large world which appears to be very common in the universe.

Doom-mongers have consistently claimed that a hidden world called Nibiru will crash into Earth.

Nasa has denied this theory, previously writing: "The planet in question, Niburu, doesn't exist, so there will be no collision.

"The story of Niburu has been around for years (as has the 'days of darkness' tale) and is periodically recycled into new apocalyptic fables."